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Non-volatile random-access memory (NVRAM) becomes a mainstream storage device in embedded systems due to its favorable features, such as small size, low power consumption, and short read/write latency. On NVRAM, a write operation consumes more energy and time than a read operation. However, current mobile/embedded file systems (e.g., EXT2/3 and EXT4) are very unfriendly for NVRAM devices. The reason...
Recently, phase change memory (PCM) has become a promising candidate to replace dynamic RAM as main memory due to its low power consumption, fast I/O performance, and byte addressability. Accompanied with the merits, the adoption of PCM may suffer from its physical characteristic of limited write endurance. Wear leveling is a well-known approach to address this issue. For PCM main memory, the design...
The support of secure deletion on formatting a file system is to make sure that when a file system is formatted, there is no way to get any file content back again. Due to the fast-growing storage capacity, the performance of secure deletion to file systems on resource-constrained flash storage devices has become a critical issue. In contrast to the existing works that take a long time on overwriting/...
The thriving growth in mobile consumer electronics makes energy efficiency in the embedded system design an important and recurring theme. Phase Change Memory (PCM) has shown its potential in replacing DRAM as the main memory option due to its (65%) reduced energy requirements. However, when considering the usage of PCM main memory, its write endurance becomes a critical issue, and wear leveling design...
Embedded computing systems usually have limited computing power, RAM space, and storage capacity due to the consideration of their cost, energy consumption, and physical size. Some of them such as sensor nodes and embedded consumer electronics only have a small-sized flash memory as their storage with a (simple) file system to manage their data, which are usually of small sizes. However, the existing...
This paper presents a digital hearing aid chip designed for Mandarin user to enhance speech quality and intelligibility. The hearing aid consists of an 18 subbands analysis and synthesis filter bank, insertion gain stage, and three channels wide dynamic range control for the new Mandarin-specific auditory compensation algorithm. A noise reduction block based on multiband spectral subtraction and enhanced...
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